A test case for ruined root

tests/test_root.py

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+from __future__ import unicode_literals
+
+from django.test import TestCase, override_settings
+
+from rest_framework import serializers
+
+
+class ChildSerializer(serializers.Serializer):
+    def __init__(self, *args, **kwargs):
+        super().__init__(self, *args, **kwargs)
+        # Not calling self.root
+
+    def to_internal_value(self, data):
+        value = super().to_internal_value(data)
+        value['root'] = self.root
+        return value
+
+
+class AnotherChildSerializer(serializers.Serializer):
+    def __init__(self, *args, **kwargs):
+        super().__init__(self, *args, **kwargs)
+        self.root  # Calling self.root to ruin the cache
+
+    def to_internal_value(self, data):
+        value = super().to_internal_value(data)
+        value['root'] = self.root
+        return value
+
+
+class ParentSerializer(serializers.Serializer):
+    children = ChildSerializer(many=True)
+    other_children = AnotherChildSerializer(many=True)
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(self, *args, **kwargs)
+        # Not calling self.root
+
+    def to_internal_value(self, data):
+        value = super().to_internal_value(data)
+        value['root'] = self.root
+        return value
+
+
+class RootSerializer(serializers.Serializer):
+    parents = ParentSerializer(many=True)
+
+
+class ListManyToManyTests(TestCase):
+    def setUp(self):
+        self.root = RootSerializer(data={
+            'parents': [{
+                'children': [{'name': 'child'}],
+                'other_children': [{'name': 'child'}],
+            }],
+        })
+        self.root.is_valid()
+
+    def test_relative_hyperlinks(self):
+        assert self.root.root == self.root
+        assert self.root.validated_data['parents'][0]['root'] == self.root
+        assert self.root.validated_data['parents'][0]['children'][0]['root'] == self.root
+        assert self.root.validated_data['parents'][0]['other_children'][0]['root'] == self.root